Packing for piston-rods



(No Model.)

E. P LEWIS & F. T. WHALEY, PACKING FOR PISTON RODS.

No. 444,002. Patented Jan. 6, 1891 W F /9 ;Z %/L 1 UNITED STATES PATENTFFICE.

EUGENE F. LElVIS AND FRANK. T. WHALEY, OF NORVVIOII, CONNECTICUT.

PACKING FOR PISTON-RODS.

SPECIFICATION forming part of Letters Patent No. 444,002, dated January6, 1891.

Application filed July 2, 1890, Serial No. 357,571. (No model.)

To ctZZ whom it may concern.-

Be it known that we, EUGENE F. LEWIS and FRANKflNVHALEYboth citizensofthe United States, and residents of Norwich, in the county of New Londonand State of Connecticut, have made certain new and useful Improvementsin Packing for Piston Rods, which improvements are fully set forth anddescribed inthe following specification, reference being had to theaccompanying sheet of drawings.

This invention is in sectional packings for piston-rods, and has for itsobject certain improvements both in the form of the packing and in themanner of supporting the same.

In order to more clearly explain the construction of our improvedpacking we have annexed hereto suitable drawings, in which- Figure 1shows in longitudinal central section the several necessary parts of ourdevice properly assembled inaportion of a cylinderhead. Fig.2,is anouter end view of the sectional packing removed, and Fig. 3 acrosssectional view of the same on line 00 as. Fig. 4 is an inner endview of the cup-section, and Fig. 5 a cross-section of the same on liney y. Figs. 6 and '7 show, respectively, an inner end and cross-sectionalview on line 2' of the socalled gland h, against which the packing abutsat the outer end when the parts are assembled.

In the drawings, the letter (t denotes a portion of a cylinder-headhaving its boss I) bored to receive the piston-rod c and counterbored toreceive the various parts of our packing.

The packing proper is formed of two rings, each made up of segments,those of one ring d being approximately L-shaped and those of the otheror inner ring cl being of suitable shape to enter and fill the otherwiseopen annular space in the L-shaped ring.

We make no broad claim to a sectional packing consisting of an L-shapedring and annular ring fitted therein, as such packing is old and wellknown; but we have improved somewhat such packings by making the innerring (1 somewhat conical at its periphery and have correspondinglyshaped the inner wall of the outer-ring, as plainly shown in Figs. 1 and3. Te find in practice that the slightlyconical bearing-surfaces thusprovided between the two rings insures a more perfect fit as the severalsegments become worn and seek to close concentrically upon thepiston-rod.

In our present form of packing we provide an encircling flat spring a,that is made thickest at the point opposite its opening. in use, aspring of this form allows the several segmental sections to open andclose more uniformly than when a spring of the same thickness throughoutits length (as of wire) is used, thus distributing the wear on thering-packings through the entire series of segments, instead ofconcentrating iton one or two segments, as heretofore.

\Ve prefer making one end of the packing cone-shaped to enter a cuppedseat in a washer f, that is located when the parts are assembled betweenthe packing proper and a spring g at the bottom of the counterboredcavity in the cylinder-head. The outer or flat face of the sectionalpacking rests against the inner face of the so-called gland h, and withthe aid of spring g forms a steam-tight joint, although left free tomove laterally as the piston-rod works through it. Gland h is heldrigidly by a plate m, bored to fit over two or more bolts 1;, projectingfrom boss I), and is firmly secured in place by nuts 70. The openings inthe gland and cylinder-head are somewhat larger than the piston-rod,thus avoiding all possibility of binding or cramping of said rod ifslightly deflected in its movement through said gland and cylinder-head,and the manner of supporting the segmental packing allows it to followany such deflection of the rod and prevents undue friction. The innerface of the gland is provided with a rabbet or groove h, which forms twoshoulders, one of which fits within the outer end of the counterbore inthe boss and centers the gland and the other shoulder abuts against theouter face of the boss, whereby the gland is rigidly held by the platem, which forces the shoulder against the outer end of the boss.

The conical end of the segmental packing, coacting with the cuppedwasher f, serves to concentrate the several segments as they are worn bythe piston-rod, while the outer (flat) end of said packing coacts withthe inner face of the gland and forms a steam-tight joint.

It is obvious that gland h and plate m When could be made as a singlepiece; but we prefer to make them separate, as we are then able to usebrass or similar metal for the gland to coact with the segmental packingand steel or iron for the plate m.

Having thus described our invention, we claim In a packing forpiston-rods, the. combination, with a counterbored boss, of a spring inthe bottom of the connterbore, a Washer having a fiat face resiingagainst the spring and having its opposite face provided with a cuppedseat, a segmental outer ring, one end of which is conical and fitswithin the cupped seat of the Washer, and the opposite end is providedwith a conical connterbore, a coneshaped segmental inner ring Within thecounterbore of the outer ring, the outer faces of said rings being fiat,means for forcing the segments of the rings inward. a fiat-surfacedgland fitting against the flat faces of the rings, and a plate forholding the gland and packing in position, substantially as described.

EUGENE F. LEWIS. FRANK. T. WHALEY. Witnesses:

FRANK I-I. ALLEN, ALONZO M. LUTHER.

